Safety-valve attachment for dental vulcanizers



Oct. 14, 1930. B. H, ABER-r 1,778,411

SAFETY vALvE ATTACHMENT Toa DEETAL vuLcANIzEEE" Filed sept. 27, 1926 INVEN TOR.

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ATTORNEYS Patented Gct. 14, 1930 UNITED STATES BYRON H. ABER/T, OF MILWAUKEE, WISCONSIN* SAFETY-VALVE ATTACHMENT Een DENTAL vULoANIzERs,

Application led September 27, 1926. y SeralN'o'. 138,032.

rIhis invention relates to improvements in lsafety valve attachments for dental vulcanizers.

Dental vulcanizers are provided with safety valves which automatically open when the steam pressure within the vulcanizer becomes too great. The heating medium remains in operation, however, with the result that ,any work within the vulcanizer is destroyed by the dry heat.

It is, therefore, the primary object of the present invention to provide an attachment for dental vulcanizer which utilizes the force of the escaping steam from the safety valve to operate a lever, the lever operating toshut olf the heating element,

A further object of the invention is to provide an attachment of the class described which will protect articles in the process of vulcanization from being destroyed by dry heat after the safety valve blows. A further object of the invention is to provide a safety valve attachment for dental vulcaniaers which will permit the safe control of vulcanization, after, as well as during working hours without direct personal attention.

A further object of the invention is to provide an attachment of the class described applicable t vulcanizers in which the heating element is supplied with gas.

A further object of the invention is to provide a safety valve attachment for dental vulcanizers which is of very simple construction, is automatic in operation, is easily installed, is strong and durable and is well adapted for the purposes described.

' Vith the above and other objects in view the invention consists of the improved safety valve attachment for dental vulcanizers, and its parts and combinations as set forth in the claims and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fig. 1 is a view of the upper portion of a dental vulcanizer showing the improved safety valve attachment installed thereon;

Fig. 2 is a plan view partly in section of the attachment and on a larger scale; and

1 Fig. 3 islanl enlarged detail viewof a lever arm formingpart'of the device.

Referringnow more particularlyto Figs.

1 and 2of-thedrawingitwill appear that the numeral 5 indicates a dentalvul'canizer of i ordinary construction in which the heating element is Vsupplied lwith fuel inthe form of gas by a tubing 'or hose l6 which'` passes-over the upper portion of the-vu'lcanizer andadjacent the lever arm 7 thereof."

The safety valve attachment comprises abraclret portion 8 lhaving a' Uishaped clip port-ion 9 to fit over and engage-thelever arm 7 of the vulcanizer. pstanding from the' medial portion of the bracl'etportifon f' is a plate 10 yto which`l ,is` pivotallysecu-red a weighted arm 1l having an enlarged end portion 12, limited in movement in one direction by a lug 13 projecting from the side of the plate 10. The upper portion of the plate 10 is provided with a U-shaped opening 14 to register with a slot 15 in the arm 11, the arm tapering outwardly from the recess or slot, as at 16.

Secured laterally to the bracket portion 8 is a coupling member 17 which intersects the gas hose or tubing 6 and within the coupling member is a suitable form of valve 18 controlled by a spring urged plate 19, which in turn is controlled by a lever 2O extending outwardly therefrom. lVhen the valve controlling the opening through the coupling and hose is open, the lever 20 is held by the registering openings 14 and 15 of the members 10 and l1, against the tension of the spring urged plate 19, as shown in Figs. 1 and 2.

As shown in Fig. l the attachment is mounted on the lever arm 7 of a vulcanizer so that the enlarged portion 12 of the arm 11 is immediately above the safety valve extension 21 of the vulcanizer. The outer end of the extension is closed by a soft metal cap 22 and when excess steam collects within the vulcanizer, the steam blows off said cap and escapes. lVith the improved attachment, when steam thus escapes, it bears against and pivots the arm 11, releasing the lever 20 which slides over the downwardly inclined edge 16 and through the recess 14 and the valve 18 is thereby closed by the spring urged ,if l 1,778,411

Y plate 19.v In this manner the-supply of vgas is automatically shut olf and the Work Within the vvulcanzer is protected from being destroyed by dry heat.

From the foregoing description it Will be seen that the improved safety valve attachment for dental vulcanizers is of very simple l and novel construction andV is Well adapted for the'purpose set forth.y

10 What I claim as my invention is:

having a safety valve opening into the atmosphere and-a fuel line, said-attachment com- Vprising-a fuel. cut-'oflintersecting the fuel f' i5 line, and eXteriorly positioned means operralole by'steamescapingto the atmosphere Cut-'0153 Y n 1 Y [2. A dental vulcanizer fuel line control,f

.zo comprising a fuel line valve', a pivotal control leverhaving an enlarged portion positioned Within-the path @of escapingv steamV from a` dental vulcanizer safetyvalve, an operating rod extending from the valve, and latch 2;, mechanism associated With said controllever for engaging a portion ofjsaid operating rod andV ladapted to automaticallyrelease the sameupon a movement of the control lever Y y in one ldirection occasioned by theV pressure goof escaping steam thereagainst. p y

In testimony whereof5 I affix my signature.V

- y BYRON H. ABERT.

- Yl. An attachment fora dental vulcanizer f f from the safety valve `for closingfs'aidV fuel*` 

